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testNSRecordsFromCache() — netty Function Reference

Architecture documentation for the testNSRecordsFromCache() function in DnsNameResolverTest.java from the netty codebase.

Function java Buffer Telemetry calls 4

Entity Profile

Dependency Diagram

graph TD
  05fbb897_f60d_49cb_1677_04923288394c["testNSRecordsFromCache()"]
  b6215f36_0afe_a284_a3fd_3999e90a8e97["DnsNameResolverTest"]
  05fbb897_f60d_49cb_1677_04923288394c -->|defined in| b6215f36_0afe_a284_a3fd_3999e90a8e97
  6379f5e9_9105_8ed2_288e_b124a4c8863f["InetSocketAddress()"]
  05fbb897_f60d_49cb_1677_04923288394c -->|calls| 6379f5e9_9105_8ed2_288e_b124a4c8863f
  f68a278a_d1e5_7598_a2d3_c261c81029bc["get()"]
  05fbb897_f60d_49cb_1677_04923288394c -->|calls| f68a278a_d1e5_7598_a2d3_c261c81029bc
  320a7bb7_1770_5812_3b9d_752bd44edf24["cache()"]
  05fbb897_f60d_49cb_1677_04923288394c -->|calls| 320a7bb7_1770_5812_3b9d_752bd44edf24
  e0db6033_0923_3a43_22a1_11714277de6c["clear()"]
  05fbb897_f60d_49cb_1677_04923288394c -->|calls| e0db6033_0923_3a43_22a1_11714277de6c
  style 05fbb897_f60d_49cb_1677_04923288394c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java lines 1874–2007

    @ParameterizedTest
    @EnumSource(DnsNameResolverChannelStrategy.class)
    public void testNSRecordsFromCache(DnsNameResolverChannelStrategy strategy) throws Exception {
        final String domain = "netty.io";
        final String hostname = "test.netty.io";
        final String ns0Name = "ns0." + domain + '.';
        final String ns1Name = "ns1." + domain + '.';
        final String ns2Name = "ns2." + domain + '.';

        final InetSocketAddress ns0Address = new InetSocketAddress(
                InetAddress.getByAddress(ns0Name, new byte[] { 10, 1, 0, 1 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        final InetSocketAddress ns1Address = new InetSocketAddress(
                InetAddress.getByAddress(ns1Name, new byte[] { 10, 0, 0, 1 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        final InetSocketAddress ns2Address = new InetSocketAddress(
                InetAddress.getByAddress(ns1Name, new byte[] { 10, 0, 0, 2 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        final InetSocketAddress ns3Address = new InetSocketAddress(
                InetAddress.getByAddress(ns1Name, new byte[] { 10, 0, 0, 3 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        final InetSocketAddress ns4Address = new InetSocketAddress(
                InetAddress.getByAddress(ns1Name, new byte[] { 10, 0, 0, 4 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        final InetSocketAddress ns5Address = new InetSocketAddress(
                InetAddress.getByAddress(ns2Name, new byte[] { 10, 0, 0, 5 }),
                DefaultDnsServerAddressStreamProvider.DNS_PORT);
        TestDnsServer redirectServer = new TestDnsServer(new HashSet<String>(asList(hostname, ns1Name))) {
            @Override
            protected DnsMessage filterMessage(DnsMessage message) {
                for (QuestionRecord record: message.getQuestionRecords()) {
                    if (record.getDomainName().equals(hostname)) {
                        message.getAdditionalRecords().clear();
                        message.getAnswerRecords().clear();
                        message.getAuthorityRecords().add(TestDnsServer.newNsRecord(domain, ns0Name));
                        message.getAuthorityRecords().add(TestDnsServer.newNsRecord(domain, ns1Name));
                        message.getAuthorityRecords().add(TestDnsServer.newNsRecord(domain, ns2Name));

                        message.getAdditionalRecords().add(newARecord(ns0Address));
                        message.getAdditionalRecords().add(newARecord(ns5Address));

                        return message;
                    }
                }
                return message;
            }

            private ResourceRecord newARecord(InetSocketAddress address) {
                return newARecord(address.getHostName(), address.getAddress().getHostAddress());
            }
        };
        redirectServer.start();
        EventLoopGroup group = new MultiThreadIoEventLoopGroup(1, NioIoHandler.newFactory());

        final List<InetSocketAddress> cached = new CopyOnWriteArrayList<InetSocketAddress>();
        final AuthoritativeDnsServerCache authoritativeDnsServerCache = new AuthoritativeDnsServerCache() {
            @Override
            public DnsServerAddressStream get(String hostname) {
                return null;
            }

            @Override
            public void cache(String hostname, InetSocketAddress address, long originalTtl, EventLoop loop) {
                cached.add(address);
            }

            @Override
            public void clear() {
                // NOOP
            }

            @Override
            public boolean clear(String hostname) {
                return false;
            }
        };

        EventLoop loop = group.next();
        DefaultDnsCache cache = new DefaultDnsCache();
        cache.cache(ns1Name, null, ns1Address.getAddress(), 10000, loop);
        cache.cache(ns1Name, null, ns2Address.getAddress(), 10000, loop);

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Frequently Asked Questions

What does testNSRecordsFromCache() do?
testNSRecordsFromCache() is a function in the netty codebase, defined in resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java.
Where is testNSRecordsFromCache() defined?
testNSRecordsFromCache() is defined in resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java at line 1874.
What does testNSRecordsFromCache() call?
testNSRecordsFromCache() calls 4 function(s): InetSocketAddress, cache, clear, get.

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